In the lithosphere of the planet is a large amount of hydrogen associated with other chemical elements. When extracted for industrial use and when interacting with atmospheric oxygen, these compounds form water. A typical example of such substances is hydrocarbon compounds, widely used in modern energy as fuel. The resulting water vapors are an additional source of fresh water extracted from geological formations. However, the lack of technology to capture these fumes now leads to additional hydration of the atmosphere, which contributes to the development of the planet's greenhouse effect. In the work on the basis of the analysis of combustion reactions, stoichiometric air energy fuels (petrol, diesel, gaseous fuels, wood) and artificial, converted from biomass and coal fuels (ethanol, methanol, butanol, and so on), and also hydrogen fuel . Compare the relative air consumption and water vapors emissions in combustion products. The process determined by the properties of constructional materials of modern achievements of engine (1400° C) defines ratios of excess air for different types of fuels, the real consumption of the air, fuel and water vapor emissions. Theoretically, the high consumption of atmospheric air using hydrogen and gas fuel is shown, the lowest in traditional motor fuels (gasoline, diesel). The useful use of organic fuel and hydrogen oxidation products for fresh water is justified - the development of technologies to efficiently extract water vapor from gas combustion products (oxidation) of energy fuels can contribute to the creation of an additional large source of fresh water commensurate with other natural sources and will contribute to the energy and environmental efficiency of traditional energy facilities. The information presented in the work of technique analysis is universal and can be used in the analysis of any existing or newly created fuel compositions.